Centimeter-Sized Quaternary Ti-Based Bulk Metallic Glasses with High Ti Content of 50 at%

Using copper mold suction casting, high Ti content alloys of Ti50Zr16Be24Ni10, Ti50Zr20Be20Ni10, and Ti55Zr15Be20Ni10 are fabricated in bulk metallic glasses (BMGs) with the critical diameters (D-c) of 10, 6, and 5mm, respectively. In particular, the Ti50Zr16Be24Ni10 BMG is the first centimeter-scale high Ti content BMG with Ti concentration as high as 50 at%. In addition, these high Ti content BMGs exhibit high specific strength and apparent plastic strain. Especially, the Ti50Zr16Be24Ni10 BMG exhibits a specific strength of 3.87x10(5)Nm kg(-1) and a plastic strain of 5.7 +/- 0.5%. Our results indicate that a combination of lower Zr and higher Be contents promotes glass formation in the Ti-Zr-Be-Ni alloy system. The developed Ti-based BMGs with high specific strength provide potentials for engineering applications.